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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118727
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118727 - Powered Converter - Tekonsha
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118727 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (52)
  • Q & A (90)
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Tekonsha Custom Fit Vehicle Wiring - 118727

  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • Powered Converter

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the tail lights on both the driver's side and passenger's side. You will need to remove the tail lights to access this harness.


T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


ModuLite Power Module

A ModuLite power module is built into this T-One connector. With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118727 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118727 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Video of T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Jeep Grand Cherokee

Shane: Hi, I'm Shane with etrailer.com. Today we're going to be taking a look at and showing you how to install the Tekonsha T-one Vehicle Wiring Harness with four pole flat trailer connector on our 2019 Jeep Grand Cherokee. This is what it's going to look like when it's installed. This is going to give you all the proper lighting functions to safely tow a trailer, your running lights, both brake lights and both turn signals.It's going to have a nice dust cap. It's going to cover your connections, keep any dirt and debris from building up. It's going to give us five amps per circuit for our stop and turn signals, 7.5 amps per circuit for our tail lights.

For easy installation, it's going to connect to factory wiring behind each tail light. We're going to have a power wire to run up to the front and attach to the battery.Now that we've gone over some the features, let's show you how to get it installed. We're going to start by removing our tail lights. We're going to have two push pin fasteners right on the inside. We're going to pull out that center like that.

And then we're going to pull out the whole thing. To remove our taillight, we're going to come straight back with it. It's a good idea if you have a trim panel tool, to help you out, you can kind of pry on it, just a little bit, to help pull it back.You're going to have some connectors in there. And what we're going to do, is we're going to go ahead and disconnect all of our wiring. We'll start with this top one.

The other two we're going to disconnect the same way. You're going to have a red tab, push up the red tab, and then you're going to push, just like that. And then we'll set our light aside. And we're going to repeat that process for the other side.Next, we need to get our wiring up behind our bumper fascia. One way to do it, is you can use an airline tube, you could use a hanger.

Anything that you can stick down in between the body and the fascia, itself. What I like to use is a nut on the end of a string. We're going to take it and drop it right down and it's going to come out the bottom, just like that. We're going to take our wiring harness, we're going to take the yellow end and we're actually wanting to get this whole end up. Stick it through, just like this.And then we're just going to match our plugs. And these three will plug back into the light. Now we can reinstall our tail light. Before we route our green wire over to our passenger side and our four pole wire to the center of the hitch, we need to mount our converter box. Our kit's going to come with some two sided sticky tape. We're going to stick it to the back of our box. We want to find somewhere flat to mount it. Right here is a nice flat spot. You just want to make sure that it's clean. Once you get that spot, we're going to take it like this, make sure you press it firmly into place.Then we can move to mounting our ground wire. Your kit's going to come with a self tapping screw, so you just want to make sure it's grounded to metal. I'm actually to go right in this area here. And we're going to take our power wire and we need to connect it to the power wire coming out of our converter box. Our kit's going to come up with a heat shrink butt connector. Connect those two ends. You may need to strip the end of your wire that comes in your kit. Then I'm going to take a heat gun, I'm going to shrink that up. If you don't have a heat gun, you can find those here at etrailer.com.For my four pole wire, I went over top of my bumper beam, which is right here and you can see I just zipped, bundled up and zip tied it here. And we're actually going to add a four pole bracket, so this will have a permanent mounting location. Green wire, you can see how I ran it right up above my bumper beam, attaching it to that existing wiring, that's the sensor wiring. You have your exhaust that comes out here. So we went over top of the bumper beam over there. We're going to do the same thing to get it up. Pull it up with the nut on the string.Our fire wire that's running to the front, you want to make sure when you route it, you route it, stay away from anything hot or moving. Found this existing line, put a couple zip ties on it, went over top of my axle, over top of my cross member here, through the bracket on my fuel tank, followed the edge of the fuel tank to this panel. Went through the panel, all the way up to this cross brace. Went over the top of this cross brace because our exhaust runs right on the inside of our frame rail there. Went right here, went across. I got it hung down right here.Now what I'm going to do, is I'm going to go up top, I'm going to drop something straight down from this area, attach my wire to it, pull it back up, so we can connect it to the battery. Run my wire straight up. Our battery is on our passenger side, so I just went around this plastic retaining clip here, ran it straight across, zip tied it on each of them, over to the passenger side, where we have our positive hookup.Now, go ahead and take a 13 millimeter socket, loosen this nut here. Go ahead and add your other butt connector on. Then you're going to take your fuse holder and your ring terminal, cut the wire in half on your fuse holder. You're going to strip back both ends. One end you're adding the ring terminal, the other end add it into your butt connector.Take your heat source, shrink up your butt connector. Go ahead and add your wire to that positive post. I already installed that. Once you have installed the wire onto the positive battery post, then you can add your fuse. Once you've added your fuse, test everything out and make sure everything's working correctly.Now let's test out our wiring using part number I26. Brake lights, left turn, right turn, running lights. That'll do it for a look at and installation on Tekonsha T-one Vehicle Wiring Harness with four pole flat trailer connector on our 2019 Jeep Grand Cherokee.


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118727

Average Customer Rating:  4.8 out of 5 stars   (52 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

- 118727
by:
2017 Jeep Grand Cherokee

After realizing that I had purchased the wrong wiring harnesses, returning it was painless. There were be complications to speak of. The staff at etrailer.com is top notch. Will continue to use them for all my towing needs. 440605



- 118727
by:
2014 Jeep Grand Cherokee

Good fit on my 2014 jeep and easy installing :) 574064



- 118727
by:
2014 Jeep Grand Cherokee

Best price on the net. Received much more than expected from etrailer ! George and his team made sure I knew when they received order, the day it shipped and the day I received the part. Excellent service. Thank you 427874



- 118727
by:
2014 Jeep Grand Cherokee

This wiring hooks up perfectly to my 2014 Jeep Grand Cherokee. I didn't give five stars because the box looked like it had been returned from someone else and just taped up. All the hookups were present however and I hooked everything up in about 1.5 hours. The instruction book is not exactly like my Jeep but close enough for someone to figure out if you've done this sort of thing before. If you have to follow instructions step by step, you may need to look this up on the video provided by etrailer or YouTube to fully understand how everything is supposed to be placed. The hardest thing is to run the power wire from the battery terminal in the engine compartment (since the battery is under the passenger seat) and fishing wires up to the taillights (metal coat hanger works good). Pop the inside piece of the two plugs out of the taillights and carefully pull taillight straight backwards. The power module fits perfectly under the vehicle and behind the driver rear tire. The power wire supplied is long enough to run from the passenger side front (positive lug under hood), down to under vehicle, along passenger side to the back, over the rear suspension, and then across to the driver side to hook to the power module. I also had to get the small bracket suggested for the four pin plug holder. Without that, your plug will just hang. All in all a good product if it lasts. I haven't hooked up a trailer yet but we'll see. 503400



- 118727
by:
2019 Jeep Grand Cherokee

Arrived quickly and as described! 641480



- 118727
by:
2014 Jeep Grand Cherokee

T I ordered a trailer hitch for a customer and it came in quick & everything is great !! Thanks 390108



- 118727
by:
2015 Jeep Grand Cherokee

trailer wire for grand Cherokee. order this part so I would not have to go back to the dealer to have comp. flashed. took a little longer to get part from ups not abig deal. install went e-z ,worst part was running power to batt. in jeep It works great ! 405060



- 118727
by:
2018 Jeep Grand Cherokee

FASTEST DELIVERY EVER... I ordered my parts on Tuesday at 7 p.m. and was at my door on Wednesday at 10 a.m. I have no idea how they did that... very impressed! After seeing their online videos on mounting a trailer receiver and wiring from etrailer and comparing prices, I am convinced the company knows how to run a business. Easy to find information and helpful articles. I'm glad to be a customer. 612025



- 118727
by:
2019 Jeep Grand Cherokee

Hitch install was a snap but wiring was not so easy. Took several hrs. and instructions didn't have battery placement correct. It is under the passenger seat not in rear of car and there is an auxiliary battery in the same box complements of the stop start feature.Hooked up wiring to the small motorcycle type battery because to access the main battery, the front seat has to be removed.Still don't know if it is correct hookup. However, all the lights ,brake,directionals and running lights work fine. Dealer where I just bought 2019 Grand Cherokee said the auxiliary battery is only 6 volts and is used to support the stop start feature.Confusing, do you think? 609532



- 118727
by:
Jeep

You can’t ask for an easier product to install and it comes with everything you need, with the exception of tools obviously. Followed video instructions and other that me not having a rack to make it easier, I couldn’t have asked for a simpler solution. Install of the wiring took me a little over an hour, and that was me having issues with trying to get my Jeep up on blocks so that I have more maneuverability under the vehicle. 466980



- 118727
by:
2019 Jeep Cherokee

The harness itself appears to be of good quality. The connectors are solid hey there’s plenty of wire to feed out through the frame to the lights. The only issue that I see in the instructions is how to connect to the battery. The instructions state to look in the trunk for the battery but unfortunately on the Jeep Grand Cherokee there is no battery in that location. The batteries are located under the passenger seat. You have to run the power wire all the way to the front of the vehicle and connect it to the jump terminal or fuse box in the engine compartment. I would purchase this again. It was nice to just plug the connectors in and not have splice into the cables. 596389



- 118727
by:

One year, no issues, works great, was affordable and easy to install. [Thumbs Up] 739181



- 118727
by:

I ordered the receiver and the harness for the trailer brake lights. Both were plug and play very easy to install. 738614



- 118727
by:
Jeep Grand Cherokee

This set up is easy to install, and has worked perfectly the entire time. I even purchased an adapter for the original 4 pin, to use it for 7 blades, and no issues whatsoever. The fun part of course is getting the black power wire all the way to the front of the Jeep. Now I will caution that I have at 5.7L Jeep Grand Cherokee Limited and getting the black wire to the battery was a little tricky. I ended up using some fishing wire to get to the undercarriage through the hollow rectangular casing that protects the other sheathed wiring for the vehicle. I have attached a photo for simplification. The rest was as easy to install as the video showed. 737931



- 118727
by:

I have purchased three trailers hitches in the pass this is number four , alway great service and hitches and fast delivery . Contacting them is always been easily and Pleasant. 733052



- 118727
by:
2015 Jeep Grand Cherokee

Carol C. was amazing, She helped us choose everything we needed from hitch to cabling and other misc stuff. Products are perfect! 732611



- 118727
by:

THE CUSTOMER SERVICE FROM CAILEE V. WAS OUTSTANDING. GREAT PRODUCTS DELIVERED IN TWO DAYS---A+ RATING. THANKS SO MUCH GUYS! 732385



- 118727
by:

Everything was in the box as promised. Delivery was on time. Would recommend this product to everyone. Thanks for your help. 730571



- 118727
by:
2016 Jeep Grand Cherokee

Installed it onto my 2016 Jeep Grand Cherokee. Like other reviewers mentioned, the instructions need to be changed. The battery is not in the back like the instructions talk about. Had to run the power lead up to the engine compartment to the fuse box stud. That meant running the hot lead up the frame and securing it to existing wire looms. Not impossible by any means just time consuming. Once hooked up it works well so plan on spending a little more time installing it than the instructions would suggest. Was surprised that the module was to be installed under the vehicle instead of inside like I have done on others before. No big deal just challenging to fish the light wires up inside the rear fenders. Not a fault of the kit, just the way the Jeep is designed. Overall satisfied with the kit, now to add the 7 way wiring for a brake controller. Next project in the future. 730205



- 118727
by:

Just received my products today. I have not installed them yet but up to this point the service has been great! Dena was super helpful when I could not figure out what I needed to install a trailer hitch and wiring for my 2019 Jeep Cherokee. 724653



- 118727
by:

Exactly what was advertised. I'm very h appy. 719195



- 118727
by:
Jeep Grand Cherokee

Have not installed yet on my Grand Cherokee but if it goes as well as it did when I used it on my Wrangler and Tyson it is a fantastic product. 710561



- 118727
by:

Great product, but give yourself time to install it. The video is way more helpful than the inclosed written instructions. Took me about 2 hours to get the wiring harness installed. Running the wire to the battery took the longest. I ran it along the wiring harness as shown in the video. I would have been lost without the video. Thanks for making this doable for a weekend do-it-yourself type. 697111



- 118727
by:
2019 Jeep Grand Cherokee

Only complaint the shipping box was damage and the currier dragged the hitch were part of it was outside of the box scraping the paint off the hitch mounting bracket. 680514



- 118727
by:

Great price on sale. Very well constructed and very heavy gauge steel. I plan to install the hitch next week on my new 2019 Jeep Grand Cherokee). Per thgeir videos and instructions, the install will truly be easy. (I plan to install the purchased wiring kit later.) My only issue is that the shipping carton needs to be better reinforced. The flanges of the htich had broken through the box and the paint was scrapped off in spots down to bare metal. No damage to the hitch itself at all but I spray painted those spots with black paint to ensure they did not rust prematurely. Very happy with the quality of the J-Pin lock#63201 as well. Same for the wiring kit. 680281


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    We have a harness that'll work on your 2019 Jeep Grand Cherokee but the Hopkins part you referenced, part # HM42545, is not a fit. It's for the previous generation Grand Cherokee on the 2005 and 2006 models. The connectors the harness plugs into behind the tail lights is not the same on the two Jeeps. Instead the harness for your 2019 is part # 118727. It's the only harness we have for the last few model years of the Grand Cherokee if they're not equipped with the tow package. I've...
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  • How to Add a Trailer Connector to a 2018 Jeep Grand Cherokee
    I do not believe all 2018 Jeep Grand Cherokees came with a factory trailer connector. In order to add one you will want to first look under the vehicle's rear bumper near the spare tire for a USCAR car plug which I have attached a photo of for you. The plug may be taped to an existing wiring harness. If you have this plug then you can use part # C55384 to add a 4-way trailer connector or part # C55774 to add a 4 and 7-way trailer connector. I have attached install videos of both harnesses...
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  • Trailer Hitch and Wiring for 2015 Jeep Grand Cherokee Altitude to Tow Boat Trailer
    For your 2015 Jeep Grand Cherokee the trailer hitch I recommend is the Draw-Tite # 75699, which is a 2" receiver with a maximum tongue weight of 750 lbs and a maximum towing capacity of 5,000 lbs. This hitch has gotten universal praise from our customers, with over 450 reviews giving it a nearly unanimous 5 stars. The accompanying photo shows how the hitch looks when installed on a Grand Cherokee. For a wiring harness, if you do not have a factory tow package you need the T-One Vehicle...
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  • Trailer Wiring Harness For 2020 Jeep Grand Cherokee
    For your 2020 Jeep Grand Cherokee the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727 will be the solution for you. The included video is a great resource to get you started. In addition to the wiring, a great hitch for your small trailer is the etrailer.com Trailer Hitch Receiver # e98901. It's matte black finish is not only attractive but scratch resistant. Finally a ball mount and tow ball will be needed. An adjustable ball mount like the Curt Multi-Ball...
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  • Trailer Hitch and Wiring for 2019 Jeep Grand Cherokee Altitude Towing a Boat Trailer
    The trailer hitch I highly recommend for your 2019 Jeep Grand Cherokee Altitude is the Draw-Tite # 75699 because it has a concealed crosstube so your Jeep maintains its clean look and is also strong, with a 5,000 lb towing capacity and 500 lb tongue weight capacity. Keep in mind you still want to verify what the towing capacity of your Jeep is in your owner's manual and abide by that. is a bolt-on installation that will not require drilling into your Grand Chrokee's frame to install. This...
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  • Trailer Hitch and Wiring Recommendation for 2019 Jeep Grand Cherokee
    If you are local to us we install hitches and wiring for free on newer vehicles like your 2019 Jeep Grand Cherokee. We'll shoot an video of the install process for both the hitch and wiring so that we can help future customers who wish to attempt the install themselves which is why we do it for free. For your vehicle we have Class III hitches with 2 inch openings like the Draw Tite part # 75699 which I recommend. It has a concealed crosstube which makes it less visible and comes with...
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  • Wiring Harness and Trailer Hitch for 2019 Jeep Grand Cherokee Limited X
    There is a trailer wiring harness that fits your 2019 Jeep Grand Cherokee Limited X; I assume you do not have the factory tow package on your Jeep and if that is the case the wiring harness that fits is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. I have added a link to a video showing how this harness installs on a 2019 Grand Cherokee for you to take a look at. If you DO have the factory tow package on your Jeep the correct harness is the T-One Vehicle...
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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
Adam R
Edited by:
Lindsey S
Video Edited:
Jacob T
Installed by:
Cole B
Written by:
Alexander C
Video by:
Zach D
Video by:
Jonathan Y
Video by:
Michael B
Test Fit:
Shane H
Test Fit:
Robert C
Updated by:
Isabelle B

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